i was told if u set it up in uk u can just pay 65k a month into your thai account , you still have t prove you have enough income or savings .i have a usa mate that does it but maybe rules are different
thai account ,or can send 65,000 a month from a uk bank instead off hold 800,000.i believe you can apply for the visa from the uk using the 65k a month method but u still need a thai bank account to send it too .contact the london embassy for what you need .uk method req proof of income etc .
Go to Cambodia or Vietnam if the Thai immigration is making it hard to enter , South Asia is huge lots of other places to go, and a lot more easy to stay long time